Final answer:
Several theories have been developed to explain lifespan development, including Freud's psychosexual development theory, Erikson's psychosocial development theory, Piaget's cognitive development theory, and Kohlberg's theory of moral development.
Step-by-step explanation:
In the study of lifespan development, several theories have been developed to explain how individuals grow and develop throughout their lives. One of the influential theories is Sigmund Freud's psychosexual development theory, which suggests that individuals pass through different stages of development that are focused on erogenous zones on the body. Another theory is Erik Erikson's psychosocial development theory, which emphasizes the role of social interactions and tasks in shaping an individual's sense of self. J
ean Piaget's cognitive development theory explains how children think and reason as they progress through different stages of development. Lastly, Lawrence Kohlberg's theory of moral development proposes that individuals go through three levels of moral thinking that build on their cognitive development.